Automatic weighing apparatus.



E. G. HBM/IAN. AUTOMATIC WBIGHING APPARATUS. APPLICATION FILED 121313.28, 1911. 1,015,561, Patented Jan.'23, 1912.

2 SHEETS-SHEET l.

AMI l l.

Figl.

1 t. 5 @fh WM (g I .v

E. G. HEDMAN.

AUTOMATIC WBIGHING APPARATUS.

APPLICATION FILED IIBB.28, 1911.

Patented J an. 23, 1912.

2 SHEETS-SHEET 2.

'UNITED sTATEs PATENT oEEIcE.

" ERIK G. HEDMAN, or STOCKHOLM, SWEDEN.

AUTOMATIC WEIGHING- APPARATUS.

To all 'whom 'it may concern:

Be it known that I, ERIK GUSTAE HED- MAN, a subject of the King of Sweden. and residing at- 46 Kungshol-msgatan, Stockholm, Sweden, have invented certain new and l useful Improvements in Automatic Weighing Apparatus, of which the follow-v ing is a specification.

The present invention relates to an arrangement in so-called roller balances z'. e. weighing apparatus having one or more rollers or so-called rolling members suspended in bands or the like adapted to wind themselves on the rolling member, when bands or the like connected thereto are actuated by the load. By this action the rolling member not only turns but as known, also moves in a direction at right angles to its axis. The latter movement has made it dicult to insure' satisfactory indication by means of a pointer or other indicator.

One object of the invention is to insure the movement of the indicating mechanism in a convenient and reliable manner and preferably also to insure a large indicating movement.

The invention is characterized as to one feature thereof by the provision besides the said rolling member or members of another roller (which I'term the indicating roller) -connected to the pointer or indicating mechanism of the weighing apparatus said latter roller being suitably placed below or above the rolling member and connected thereto suitably by winding bands 'or other flexible connectors but it might be placed at the side of the roll-ing member.

Inorder that the indicating roller shall not be exposed to lateral strains and thus not exposed to friction in the bearings or the like by which it might have a disturbing actionl on the turning force the roller is suitably -balanced in its turning movement by being provided with one or more band paths concentric with the roller such band paths being of larger diameter than the paths on such roller for the bands from the rolling member and said band paths of larger diameter having attached to them bands or the like which carrying the counterweight of the weighing apparatus, exert a turning action on the indicating roller in a direction opposite to that ,in which it is turned by the rollin member. The turning moments acting at tlgie indicating roller thus Specification of Letters Patent.

Appiicanon med February 2s, 1911. serial No. 611,432.

Patented Jan. 23, 1912.

1 fn-fyi",- 5 sin u always balance one another and the indicat-f ing roller will be practically freely suspended. To insure however that the axis of the indicating roller will be maintained in a constant position it is suitably centered in relation to the frame but in effect no weight is transmitted through the axis.

The invention is further characterized by the arrangements which are hereinafter more vparticularly described with reference to the accompanying drawings which show a form of embodiment 'of the invention.

Figure l is a rear view and partial section of a weighing apparatus arranged accord ing to the invention and Fig. 2 is a side elevation ofthe weighing apparatus viewed from the side.

c is the rolling member and Z) are the supporting bands connected thereto, said bands being attached to vthe upper part of the frame c, d is the load band of the weighing apparatus which runs on the path ve, of the spiral or volute form shown, of the rolling member a and leads to a rod f connected to an arm g carrying the weighing scales z.. Connected to the rolling member av are two .bands i which tend to turn the rolling member a. in the direction in which the bands b tend to turn it. The bands z' are connected to the indicating roller 1c which is firmly connected to a tube or the like Z one end of which carries the pointer m. Extending through the other end of the vtube is a needlelike axle n attached to the frame c, which axle, however, does not in effect carry the weight of the indicating roller or resist any strain but merely formsA a pivot for the roller. Bands o are connected to the indicating roller in such va manner that they tend to turn the same in a direction opposite to that in which the bands z' tend to turn it. The bands o are connected to and carry the counterweight p of the weighing apparatus.

The arrangement hereinbefore described acts in such a manner that, when the weigh ing apparatus is loaded anda pull is thereby exerted on the load band d, the rolling member a. is turned and at the same time rises by rolling up the bands b and thereby winding the'bands b thereon. Therolling member thereby exerts a pulling action on the bands z' and turns the indicatingI roller 1 so that the pointer turns, said movement being in proportion to the sum of the turning movement and vertical movement of the the paths for the bands i on the rolling member and on the indicating roller are of the same diameter and the indicating roller therefore, owing to the fact thatthe rollmg vmember rises as it rolls up the bands b, re-

volves -at twice the rate of the rolling member. By choosing the-ratio betweenthe dijameters of the4 rolling-and indicating members as desired the pointer mayiobviously be caused to.turn still faster or slower than the rolling member. It should here be explained that the weight of the indicating roller la,

and the diameters of the paths on such. roller for the bands z' ando respectivelyare so related that regarding the points where the bands z' first touch the roller'as being a fulcrum the moment of the weight of the roller at one side of the fulcrum balances the pull of the bands 0 thus substantially relieving the center pin of the roller 7c of all strain.

The counterweight p of the weighing apparatus is movable'up and down in a stationary tube g as shown in the drawings. This tube' not only forms a reliable guide :t'or

the weight but also serves for checking or4 steadying the movements of the weighing apparatus thereby avoiding undue oscillation and bringing the moving parts quickly to rest. For this purpose the weight p has loosely suspended from a point 'therein a piston r the edge of which is yslightly rounded and this piston is just sufiiciently less in diameter than the tube gto allow air to pass -from oneside ofthe piston to the other.

The tube is closed at the bottom and the Y movement of the Weight p and the piston 7 within the tube will thus befobstructed by the fact that air must squeeze past the edge of the piston when the `weight moves and whether the movement takes place in consequence of the weighing apparatus .being loaded or whether the weighing apparatus has just been unloaded, the 4weight is immediately checked. The yielding connection between the Weight p and the piston T is obtained, as shown in the drawing, by a pinlike part s which'` projects upwardly from the-,piston into a corresponding spacious cavity in the weight which has a hook, pin or.

the like t on which the part s is loosely hung so'as to be able to swing freely with the pist0n in relation to the Weight. 'For locking the weighing apparatus a handle t rigid with an arm /v which is adapted to be turned` in ,the frame is provided said arm being adapted to be turned into engagement with a hook u of the weight so that the Weight 'cannot be moved upward.

In order to provide easy working and simplicity in the movement of the scale It flexible spring bands w, y, a, are placed in the joints between the arm -g andthe frame of the weighing apparatus as well as between lthe scale and its supporting'bar o but other suitable joints maybe provided.

. mits the pull lof the load to the load-carrying l roller, a supporting flexible connector along which the load-carrying roller'iolls as it is turned by the load, a support' for carrying said supporting flexible connector, indicating-mechanism, a roller to actuate said mech-- anism, a flexible connector attached to the circumference of the load-carrying 'roller' and passing around the periphery of the indicatng mechanism actuating roller vand roller, and means by which the indicatingmechanism actuating-roller is` caused to turn back again on the return movement .ofthe load-carrying roller.. v

2. In a `weighing apparatus, a load-carrying roller, a .flexible connector which transmits'the pull of thelloagd to the load-carrying roller, a supporting flexible connector along lwhich the load-carrying roller rolls as` it is turned by the load, a support for carrying said supporting flexible connector, indicating-mechanism, a roller to actuate said mechanism, a flexible connector attached to the circumference of the load-carrying roller and passing around the periphery of the indicating-,mechanism 'actuating-roller and 'turning such rollerl from the load-carrying roller, means by which the indicatingmechanism actuating-rol-ler'is caused to turnback again on the return' movement of the load-carrying roller, and means .by which thel axis -o the indicating-mechanism actuatingroller is maintained in a constant position. 3. In a weighlng apparat-us, a load-carry.-

Vturning suchroller from the load-carrying ing roller, a iexibleconnector which transmits ,the pull of the load to a load-carrying roller, a supporting flexible connector along whichl the load-carrying roller rolls as it is turned by the load, a support for carrying said supporting iiexible connector, indicating-mechanism, a rollerto actuate said mechila anism, a flexible connector attached to the circumference of the load-carrying roller and passing around the periphery of the indicating-mechanism f actuating-roller -and turning such roller from the load-carrying roller, a second flexible connector andm'eans by which it is suspended from the periphery of theindicating-mechanism actuating-- roller, said connector: carryingv acounter'- weight and pulling such roller in a direction 4 tending to revolve it in the opposite direction to that in which it is turned from thev load-carrying roller.

4:. In'a weighing apparatus, a load-ccarryt 'ving roller, a' flexible ,cennepter which'transmits the pull of the load to the ml-carrying roller, a'supporting'ilexible connector along which the load-carrying roller'ro'lls as it is turned by the load, a support for carrying said supporting flexible connector, indicating-mechanism, aroller to actuate said 4mechanisn, a flexible connector attached vto the circumference of thel load-carrying roller and .passing around the periphery of the indicating-mechanism actuating-roller and turning suchroller from the load carrying carrying roller acts uponthe indicating-- roller, a secondflexible connector, means by, which itis suspended from the periphery of the indicating mechanism actuating roller,

said connector carrying a counterweight and pulling such roller in a direction tending to revolve it inthe opposite direction to that inv v which it is turned from the load-carrying roller, the pull of the counterweight acting upon vthe indicating-mechanism actuatingroller at a point farther from the axis of the roller than the point at which the loadmechanlsm actuating-roller and balancing the weight of the latter roller about the point .oplei ofthil patent may be obtained atvwhich the load-'carrying roller acts thereupon whereby the axis n of the indicatingmechanism actuating-roller tends to remain stationary and the weight of such roller and of the counterweight to be carried entirely by the loa'd carrying roller p 5. In a weighing apparatus,a load-carrying roller, a flexible connector which trans- ,mits the pull of the load to the load-Carr ing roller, a supporting flexible connector a ongl whichl the load-carrying roller rolls as it is turned by the load, a supportv for carrying ,said supporting iexible connector, indicat- .the axis of such.- roller ing-mechanis1n,a roller to actuate said mech--` anism, a flexible connector attached to the circumference lof the load-carrying roller and passing around the periphery of thev indicating-mechanism actuating-roller and turning such roller from the load-carrying roller, a second flexible connector, means by whichit is suspended from' the periphery of the' indicating meet` anism actuating roller said connector carrying a counterweight and pulling such roller in a direction tending torevolve it in the opposite direction to that in `which it is 'turned` from the load-carrying roller and of the counterweight to'be carried Aentirely by the load-carrying roller, and a pin which passes through the indicatingmechanism actuating-'roller to insure that stant position,

In witness whereof I havehereunto signed my name this 15 day of F' 1wruary, 1911, in the presence of two subscriblng witnesses.

ERIK G, HEDMAN.

Witnesses: v

MAX voN Swamp, ALFRED H. WATKINS.

for ve cents nel, 'by addressing the' Commhsionerfof, Patents,

Wallington, D. 0.

will remain in a con- 

